2000 DHS transmission light on
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  • 2 Post By 98eldo32v
  • 2 Post By maeng9981
Northstar Engines and System Technical Discussion Discussion, 2000 DHS transmission light on in Cadillac Engine Technical Discussion; I was driving my deville on the highway for a while when the "service transmission" alert came on. I hadnt ...
  1. #1
    VanillaMarie26 is offline Cadillac Owners Member
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    2000 DHS transmission light on

    I was driving my deville on the highway for a while when the "service transmission" alert came on. I hadnt had any issues with hard shifting up until then. When the light came on, the automatic transmission started shifting hard when going into 2nd gear. I ran the codes myself which cleared the code and now it shifts fine. Error code p0734 was the code that came up which indicated slipping in 4th gear (I haven't noticed any issues with fourth gear). Any thoughts?

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  3. #2
    rodnok01's Avatar
    rodnok01 is offline Cadillac Owners Connoisseur
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    Re: 2000 Deville DHS transmission light on


  4. #3
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: 2000 Deville DHS transmission light on



    Help us help you and always post the code definitions along with the codes. No one has them memorized.

  5. #4
    VanillaMarie26 is offline Cadillac Owners Member
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    Hey...the part where i said it mentioned the issues with 4th gear is what the code meant. I dont seem to have an issue with 4th, i only noticed it in 2nd.

  6. #5
    98eldo32v's Avatar
    98eldo32v is offline Cadillac Owners Connoisseur
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    Re: 2000 Deville DHS transmission light on

    The first and last time I saw "Service Transmission" on my deville, it eventually had to have the unit replaced.....


    I don't want to ever see that message again
    maeng9981 and maeng9981 like this.

  7. #6
    VanillaMarie26 is offline Cadillac Owners Member
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    By unit what are you referring to? The solenoid?

  8. #7
    maeng9981's Avatar
    maeng9981 is offline Cadillac Owners Connoisseur
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    Re: 2000 DHS transmission light on

    He means the whole 4T80E unit. Same experience here.

    If it shifts fine and the code is not returning, pray that it never comes back. If the "Service Transmission" message and a code is set, your PCM will command full line pressure on the transmission, that's likely why you experienced sudden harsh 2nd shift.

    Fluid too old or contaminated? Incorrect amount? Debris in the system? I'd drain and refill trans fluid, and clean the screens and the magnet, even if the code does not come back.
    98eldo32v and 98eldo32v like this.

  9. #8
    VanillaMarie26 is offline Cadillac Owners Member
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    That makes sense, thank you so much for the help!

  10. #9
    stoveguyy is offline Cadillac Owners Connoisseur
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    So your shift solenoids fail. Yo will get a service trans message? Or is the message for changing fluid based on miles or severe conditions? Never had a solenoid go out. Assume if trans is not shifting right you will get a code but not the service message?

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